They told us and I did not write it down. Mark Wrathal wrote it down I think. Mark?
It is flame sprayed something or other. Not Nicosil. The rotor housing is Nicosil.
It is quite thick as there is a slight recess machined in the end housing to accept
the coating. If it were me I would just put hardened and
ground sheet steel in there.

Paul Lamar

Paul, with the small area near the pinch of the trochoid
you would probably have trouble keeping sheet steel flat.
The coating if successful, would be easier to do. Fewer machining ops. 
I haven't given up on a source for coatings.
Bill Jepson

I think you could stud weld on some screws and bolt it on. I think it would be
a lot more durable than coatings. Either that or cast it in like Mazda does on
the rotor housings. One could also press in special serrated flat head steel pins 
in undersize holes in the aluminum casting. Then grind it smooth.

Paul Lamar
 
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